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| THS4531 Datasheet, PDF (30/55 Pages) Texas Instruments – Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier | |||
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THS4531
SLOS358B â SEPTEMBER 2011 â REVISED MARCH 2012
VIN+
No Connection
VINâ
No Connection
Power
Supply
Network
Analyzer
RG
RF
Cal Diff Probe
RO
RIT
0.22 μF
RG
RIT
VS+
+
VOCM
â
VSâ
VOUTâ
THS4531
VOUT+
RO
ROT
RF
www.ti.com
Measure With
Diff Probe
Figure 71. PSRR Test Circuit
VOCM Input
The circuit shown in Figure 72 is used to measure the transient response, frequency response and input
impedance of the VOCM input. For these tests, the cal point is across the 49.9⦠VOCM termination resistor.
Transient response and frequency response are measured with RCM = 0⦠and using a high impedance
differential probe at the summing junction of the two RO resistors, with respect to ground. The input impedance is
measured using a high impedance differential probe at the VOCM pin and the drop across RCM is used to calculate
the impedance seen looking into the amplifierâs VOCM input.
VIN+
No Connection
RG
RF
RO
VOCM
From Network
Analyzer
Cal Diff Probe
RIT
RCM
For ZIN
49.9
Measure With
Diff Probe Here
VIN±
RG
No Connection
RIT
NC
VS+
+
VOCM
-
VOUT±
THS4531
VS±
VOUT+
RO
RF
For BW
Measure With
Diff Probe Here
Figure 72. VOCM Input Test Circuit
30
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Product Folder Link(s): THS4531
Copyright © 2011â2012, Texas Instruments Incorporated
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